unknown is narrowed to never inside reachable conditional blocks

[rsimoes]

TypeScript Version: 4.1.2 & 4.2.0-dev.20201205

Search Terms: unknown never NOT generic

Code

const logIfFoo = (maybeFoo: unknown) => {
  if (maybeFoo instanceof Object && "bar" in maybeFoo) {
    console.log(maybeFoo);
  }
}

logIfFoo({ bar: "baz" });

Expected behavior:
Transpiled JS that yields no output--given the inferred typing of maybeFoo to never inside the conditional block

Actual behavior:
Output of { bar: 'baz' }

Playground Link: https://www.typescriptlang.org/play?ts=4.1.2#code/MYewdgzgLgBANiA5gSQGYDEQhgXhgCgFsBDATwCMBTTEALhgFcwBrMEAdzAEpcA+GAN4BYAFAwYAS1QESFalkmQoxMMEohpAeXIArSsFgAyQzABE5YgCdTimLKo0ewseJihIIOJQB0CRETIHLC4AblFxAF9RCLCRUXdoGFQFPAEYC0t6c2IALxsY0T80GnxkkFDRIA

[MartinJohns]

Duplicate of #38608.